Oil-Dri L90811 15"W x 19"L Oil-Only Middle Weight Dimpled Perforated Pads, 100 Pads/Box These mid-weight polypropylene pads are hydrophobic, repelling water while absorbing petroleum based fluids Polypropylene layers are dimpled to increase strength and absorption rate Ideal for outdoor and marine applications Absorbs up to 24 gallons per box